Groundbreaking study finds huge amount of litter at deepest point in Mediterranean Sea - Plastic accounts for nearly 90 per ...

It is very important that your submarine starts off at the right density. It shouldn’t bob straight to the top of your cup nor should it sink. Make sure it moves down a little, and then travels ...

and the Pentagon worries that a decreased Russian submarine presence along the eastern coast of the United States may imply a higher density in Arctic waters. With the collapse of the Warsaw Pact ...